Testing With Five Users Is Right. The Way Most Teams Quote It Is Wrong.
The five-user rule is real math, and it's routinely misquoted to justify testing once and shipping. What the number actually depends on, and when five is nowhere near enough.
Category: Fundamentals
Product sense is pattern recognition, and patterns only form when you stay long enough to see your bets graded. Why most PM careers quietly starve the one skill that gets you promoted.
Silent agreement in a stakeholder meeting isn't commitment. How to make disagree and commit actually hold, in the order Grove and Bezos meant it.
Rework rate is now a core delivery metric, and most product managers can't tell you theirs. It hides inside a velocity chart that looks perfectly healthy.
Departing customers click the reason that closes the cancellation fastest, not the true one. Why churn interviews beat the exit-survey dropdown, and how to run them.
Senior PM is a terminal level by design: no one is scheduled to promote you past it. Why more execution stops paying, and what the next rung actually rewards.